Edris, J., Gupta, N. and Zereffa, E. 2019. Synthesis of Silica Supported Iron Oxide Nanoparticles for Hexavalent Chromium Removal from Aqueous Solutions. Ethiopian Journal of Science and Sustainable Development. 6, 2 (Oct. 2019), 81 - 93. DOI:https://doi.org/10.20372/ejssdastu:v6.i2.2019.109.